Due to the Tohoku-Chihou-Taiheiyou-Oki Earthquake which occurred on March
11, 2011, TEPCO's facilities including our nuclear power stations have been
severely damaged. We deeply apologize for the anxiety and inconvenience
caused.
With regard to the accident at Fukushima Daiichi Nuclear Power Station, on
April 17, 2011, we have compiled the roadmap towards restoration from the
accident and on July 19 we accomplished the Step1 target "Radiation dose
is in steady decline". Then on December 16 we confirmed the accomplishment
of the Step 2 target "Release of radioactive materials is under control
and radiation doses are being significantly held down".
In addition, on December 21, 2011, we have compiled the "Mid-to-long-Term
Roadmap toward the Decommissioning of Fukushima Daiichi Nuclear Power Units
1-4, TEPCO".
In addition to the maintenance of the plant's stable condition, we will
implement Mid-to-Long Term countermeasures towards the decommissioning of
Fukushima Daiichi Nuclear Power Units 1-4 to enable evacuees to return to
their homes as soon as possible and reduce the anxiety of the people in
Fukushima and the whole nation as soon as possible.
Below is the status of TEPCO's major facilities.
* The updates are underlined
[Nuclear Power Station]
· Fukushima Daiichi Nuclear Power Station: Unit 1 to 3: shut down due to
the earthquake:
(Units 4 to 6: outage due to regular inspections before the earthquake)
- At 12:00 pm on February 19, since we finished to check out noble gas
monitoring of the PCV gas controlling system of Unit 2, we started
operation(sampling data of noble gas). At 3:30pm on February 19, we
started continuous monitoring for the controlling system.
- At 3:04 pm on February 19, we confirmed the water leakage at the flange
of header valve of water feeding line. The leaked water was filtrate
water and the amount was approx. 20L. At 3:55 pm on February 19, the
valve of upper stream was closed, and the water leakage was stopped.
The radiation dose in ambient air near the leaking point was almost
same as that of background. As the result of sampling of leaked water,
we confirmed that the sample data of Cesium-134 and Cesium-137 were
below measurable limit. In order to prevent the leakage from the
surrounding gutter, at 4:20 pm on February 19, we finished piling up
the sandbags. After then, we confirmed that the gutter which sandbags
piled on was dry, and no water leakage happened to the ocean.
- At 10:00 am on February 19, as for the accumulated water at the Unit 6
Turbine Building basement, transfer to the temporary tank commenced.
At 4:00 pm on February 19, transfer stopped.
- With regard to the water injection volume for Unit 2 reactor, which
was increased with temperature figure raising, we adjusted the original
volume before temperature increasing (Feed water system: approx.
3.0m3/h, core spray system: approx. 6.0m3/h). At 6:40 pm on February
19, we changed the water injection volume from core spray system from
approx.10.0m3/h to 6.0m3/h (The water injection level from feed water
system is continuing at approx. 7.6m3/h).
- At 8:35 am on February 20, since the amount of disposed water in the
Second Cesium Adsorption instruments decreases gradually, we suspended
the system for cleaning.
- At 9:17 am on February 20, due to switching the transfer pumps, we
transferred the accumulated water at the basement of Unit 2 Turbine
Building to Centralized Waste Treatment Facility (Miscellaneous Solid
Waste Volume Reduction Treatment Building [High Temperature Incinerator
Building]) stopped. At 9:39 am on February 20, the transfer restarted.
- At 9:30 am on February 20, regarding the accumulated water at the
basement of Unit 3 Turbine Building, transfer to Centralized Waste
Treatment Facility (Miscellaneous Solid Waste Volume Reduction
Treatment Building [High Temperature Incinerator Building]) started.
- At 10:00 am on February 20, as for the accumulated water at the Unit 6
Turbine Building basement, transfer to the temporary tank commenced.
· Fukushima Daini Nuclear Power Station:
(Units 1 to 4: shutdown due to the earthquake)
· Kashiwazaki Kariwa Nuclear Power Station: Units 6: under normal operation
(Units 1 to 5 and 7: outage due to regular inspections)
[Thermal Power Station]
· Power supply has returned to normal and the facilities damaged by the
earthquake are now being handled in a timely manner.
[Hydro Power Station]
· Power supply has returned to normal and the facilities damaged by the
earthquake are now being handled in a timely manner.
[Impacts on Transmission Facilities]
· Power supply has returned to normal and the facilities damaged by the
earthquake are now being handled in a timely manner.
[Impacts on Power Supply and Demand Balance]
This winter, there are some minus factors such as the regular inspection
of Unit 5 at Kashiwazaki-Kariwa Nuclear Power Station. On the other hand,
there are several plus factors such as the recovery of the common thermal
power stations which suffered the earthquake. As a result, we expect to
secure 53.7 GW (at the end of February) supply power.
Compared to the maximum demand in the last winter, which is 51.5 GW, we
will have 2.2 GW generation reserve margin.
We expect to maintain stable power supply this winter. However, as there
remains possibilities of unplanned shutdowns at our power stations and
growth in the demand according to the rapid change in the temperature, we
would like to ask your reasonable effort to save electricity.
We will continue to make our efforts to maintain stable operation and
maintenance of the power facilities in order to "prevent in principle"
the planned blackouts and secure power supply.
Appendix: Past Progress (As of 10:00 am on February 20, 2012) (PDF 658KB)
Appendix: Past Progress (From March 11, 2011 to July 31, 2011) (PDF 225KB)
* Revised past progress
